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    Hi Malcom,<br>
    <br>
    That is on purpose - being behind a NAT network means you want to
    hide any subnet connect to that network from the outside world.<br>
    Any outgoing connection will look like it came from the NAT Router
    "public" IP.<br>
    If you want to allow specific connections to be allowed in, you need
    to configure port forward - so far, I don't think I tell you
    anything new.<br>
    <br>
    But if you need the "outside" world to know about "inside" networks,
    then NAT is not the right choice. You need to switch to a non-NAT
    solution like Bridged mode (or Host-Only with routing enabled on the
    host) and the "outside" world needs to know about those "inside"
    network with two possibilities:<br>
    - Static routes on all routers that need to deal with those subnets<br>
    - Internal routing protocol like RIP, EIGRP or OSPF that will
    auto-detect routes and populate routing tables of routers.<br>
    <br>
    <div class="moz-cite-prefix">On 03/10/16 13:30, Malcolm Clarke
      wrote:<br>
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      Dear Development Group<br>
      <br>
      I am trying to demonstrate routing in a virtualised network
      created using VirtualBox with a FreeBSD server acting as router
      between 2 virtual networks. One network is set as NAT Network to
      allow access to outside world. However, although packets can be
      directed from the router to the NAT router for outward delivery,
      the NAT router does not know how to deliver the incoming packets
      for the "hidden" subnet.<br>
      <br>
      I wonder if anyone has modified the NAT network to allow simple
      static routes or default gateway to support this cnfiguration.<br>
      <br>
      I do not know the interest for this functionality and whether the
      work is justified for the use that would be made.<br>
      <br>
      Regards<br>
      <br>
      Malcolm<br>
      <br>
      <br>
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          <p class="MsoNormal"
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            <b><span style="color:#C0504D">Malcolm Clarke </span></b><span
              style="font-size:10.0pt;color:#C0504D">BSc (Hons), PhD</span></p>
          <p class="MsoNormal"
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            <span style="color:#1F497D">Reader in Telemedicine and Data
              Communication Systems</span></p>
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            <span style="color:#C00000" lang="DE">T</span><span
              style="color:#002060" lang="DE">
            </span><span style="color:#1F497D" lang="DE">+44 (0) 1895
              265053</span></p>
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            <b><span style="color:#1F497D">Brunel University London</span></b></p>
          <p class="MsoNormal"
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            <span style="color:#C0504D">College of Engineering, Design
              and Physical Sciences </span>
          </p>
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            <span style="color:#1F497D">Department of Computer Science </span></p>
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            <span style="color:#1F497D">HNZW011, Heinz Wolff Building,
              Kingston Lane, Uxbridge, Middlesex, UB8 3PH</span></p>
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            <b><span style="color:#002060" lang="DE"><a
                  moz-do-not-send="true" href="http://www.brunel.ac.uk/">www.brunel.ac.uk</a></span></b></p>
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            <span style="color:#1F497D">Connect with the university on<b>
                Linkedin, Twitter, Facebook</b></span></p>
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</pre>
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